Annual report pursuant to Section 13 and 15(d)

Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail)

v2.4.0.6
Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Apr. 30, 2012
Finite-Lived Intangible Assets [Line Items]    
2014 $ 8,592  
2015 8,156  
2016 7,017  
2017 5,696  
2018 5,008  
Thereafter 19,967  
Total estimated amortization expense $ 54,436 $ 16,623